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# -*- coding: utf-8 -*-
# ######### COPYRIGHT #########
# Credits
# #######
#
# Copyright(c) 2015-2025
# ----------------------
#
# * `LabEx Archimède <http://labex-archimede.univ-amu.fr/>`_
# * `Laboratoire d'Informatique Fondamentale <http://www.lif.univ-mrs.fr/>`_
# (now `Laboratoire d'Informatique et Systèmes <http://www.lis-lab.fr/>`_)
# * `Institut de Mathématiques de Marseille <http://www.i2m.univ-amu.fr/>`_
# * `Université d'Aix-Marseille <http://www.univ-amu.fr/>`_
#
# This software is a port from LTFAT 2.1.0 :
# Copyright (C) 2005-2025 Peter L. Soendergaard <peter@sonderport.dk>.
#
# Contributors
# ------------
#
# * Denis Arrivault <contact.dev_AT_lis-lab.fr>
# * Florent Jaillet <contact.dev_AT_lis-lab.fr>
#
# Description
# -----------
#
# ltfatpy is a partial Python port of the
# `Large Time/Frequency Analysis Toolbox <http://ltfat.sourceforge.net/>`_,
# a MATLAB®/Octave toolbox for working with time-frequency analysis and
# synthesis.
#
# Version
# -------
#
# * ltfatpy version = 1.1.2
# * LTFAT version = 2.1.0
#
# Licence
# -------
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# ######### COPYRIGHT #########
"""Module that extends fir windows with zeros
Ported from ltfat_2.1.0/sigproc/fir2long.m
.. moduleauthor:: Denis Arrivault
"""
from __future__ import print_function, division
import numpy as np
from ltfatpy.fourier.middlepad import middlepad
def fir2long(gin, Llong):
"""Extend FIR window to LONG
- Usage:
| ``g= fir2long(g, Llong)``
- Input parameters:
:param numpy.ndarray g: input window
:param int Llong: new length
- Ouput parameters:
:return: extended window
:rtype: numpy.ndarray
``fir2long(g,Llong)`` will extend the FIR window **g** to a length
**Llong** window by inserting zeros. Note that this is a slightly
different behaviour than :py:meth:`~ltfatpy.fourier.middlepad`.
``fir2long`` can also be used to extend a FIR window to a longer FIR
window, for instance in order to satisfy the usual requirement that the
window length should be divisible by the number of channels.
.. seealso:: :func:`~ltfatpy.sigproc.long2fir.long2fir`,
:func:`~ltfatpy.fourier.middlepad.middlepad`
"""
if not isinstance(gin, np.ndarray):
raise TypeError("gin must be a numpy array")
# if gin.ndim > 1:
# raise ValueError("gin must be a vector (dim = 1)")
Lfir = gin.shape[0]
if Lfir > Llong:
raise ValueError('Llong must be larger than length of window.')
if Lfir % 2 == 0:
# HPE middlepad works the same way as the FIR extension (e.g. just
# inserting zeros) for even-length signals.
gout = middlepad(gin, Llong, centering='hp')
else:
# WPE middlepad works the same way as the FIR extension (e.g. just
# inserting zeros) for odd-length signals.
gout = middlepad(gin, Llong)
return gout
|
